EDAC, ppc4xx_edac: Fix module autoload for OF platform driver

This platform driver has an OF device ID table but the OF module alias
information is not created so module autoloading won't work.

Signed-off-by: Luis de Bethencourt <luisbg@osg.samsung.com>
Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
Cc: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
Cc: linux-edac <linux-edac@vger.kernel.org>
Link: http://lkml.kernel.org/r/20150917114619.GA13145@goodgumbo.baconseed.org


Signed-off-by: Borislav Petkov <bp@suse.de>